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Vibrations of the shell, which corresponds to the fuselage of a small pasenger airplaine, with "smeared" stiffeners; both the stringers and frames are "smeared."

Vibrations of the shell, which corresponds to the fuselage of a small pasenger airplaine, with “smeared” stiffeners; both the stringers and frames are “smeared.”

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The Movie show numerical simulation of the vibrations of the stiffened and unstiffened closed shells. Parameters of the shell and stiffeners correspond to the light-airplane fuselage with a radius R = 1.3 m, a thickness of aluminum skin of 1.2 mm, a distance between the frames of 0.45 m, and a distance between stringers of 0.145 m. The number of trigonometric vibration forms in the calculation is limited to 224 × 448 in the circumferential and longitudinal directions. All the vibration eigenfunctions with a frequency up to 5 000 Hz are taken into consideration. The tangential inertial terms are taken into account; all the eigenfunctions of longitudinal vibrations are truncated.